lustrated by will produce no effect on the polarized beam, but most The best position for the polarizing plate is near a apparatus costing less than a dime, in a manner that thick pieces of glass, such as paper weights, ink stands, window, with the broad light of the clear sky shining can but… … lenses often show gorgeous colors when turned at dif- GLASS STRAINED BY HEAT. ferent angles in the beam of polarized light. A small piece of window glass and a black covered The writer well remembers the smilesprovoked among analyzing plate on the axis of the By turning the book constitute the…
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